assigning values to an array that already has values

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Raul Castillo 2019-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/487926-assigning-values-to-an-array-that-already-has-values

评论： ME 2019-10-29

so for example my array lets say s= [1 4 2 3 4 1 4 2 3 4 ]

and i want to assign 1=20 2=30 3=50 4=80 so that my new array would now be [20 80 30 50 80 20 80 30 50 80] how would i do this using loops?

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Answer 1

ME 2019-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/487926-assigning-values-to-an-array-that-already-has-values#answer_398625

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Totally not an elegant answer but you could use something like:

for i=1:numel(s)
    if(s(i)==1)
        s(i)==20;
    elseif(s(i)==2)
        s(i)==30;
    elseif(s(i)==3)
        s(i)==50;
    elseif(s(i)==4)
        s(i)==80;
    end
end

This would then leave anything other than 1, 2, 3 and 4 unchanged.

As I say, it’s not elegant but it might give you enough of a start.

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Raul Castillo 2019-10-28

i do not know if i am doing it correctly the output is coming back as ans = logical 0

ME 2019-10-29

在 MATLAB Online 中打开

Apolgies this was my fault. There should not be "==" in the commands to swap to the updated values, i.e. the code should be:

for i=1:numel(s)
    if(s(i)==1)
        s(i)=20;
    elseif(s(i)==2)
        s(i)=30;
    elseif(s(i)==3)
        s(i)=50;
    elseif(s(i)==4)
        s(i)=80;
    end
end